package com.example.mobile2021606185zhn0402homework;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private ImageView imageView;
    private Button btnMainNext;

    private int[]lines;
    private int linesID = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
     btnMainNext.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
             lines = new int[6];
             lines[0] = R.drawable.line1;
             lines[1] = R.drawable.line2;
             lines[2] = R.drawable.line3;
             lines[3] = R.drawable.line4;
             lines[4] = R.drawable.line5;
             lines[5] = R.drawable.line6;

             imageView.setImageResource(lines[linesID+1]);
             linesID += 1;

         }
     });
    }

    private void initView() {
        imageView = (ImageView) findViewById(R.id.imageView);
        btnMainNext = (Button) findViewById(R.id.btn_main_next);
    }
}